Consolidated Statements Of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Adjustments for New Accounting Principle, Early Adoption [Member]	Common Stock [Member]	Retained Earnings [Member]	Retained Earnings [Member] Adjustments for New Accounting Principle, Early Adoption [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (7)	$ (7)			$ (7)
Adjusted Balance	17,174		$ 2,327	$ 17,437		$ (2,598)	$ 8
Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2016	17,181		$ 2,327	17,444		(2,598)	8
Balance at Dec. 31, 2016	17,181
Balance (shares) (Scenario, Previously Reported [Member]) at Dec. 31, 2016			573
Balance (shares) at Dec. 31, 2016			573
Comprehensive income
Net earnings	340			339			1
Other comprehensive income (loss)	24					24	0
Total comprehensive income	364
Cash dividends paid - $0.32 per share	(183)			(183)
Stock Repurchased During Period, Value	$ (248)			(248)
Stock Repurchased During Period, Shares			(5)
Stock compensation expense, shares	1
Stock compensation expense	$ 32		$ 32
Other, shares			0
Other	(10)		$ (9)	0		0	(1)
Balance at Mar. 31, 2017	$ 17,129		$ 2,350	$ 17,345		$ (2,574)	$ 8
Balance (shares) at Mar. 31, 2017			569